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Radiator Valve Sizes

Discuss Radiator Valve Sizes at UK Plumbers Forums; I tried to adjust the lockshield valve on my 15 year kitchen radiator and it started leaking. I therefore decided to replace it and thought this would be a straightforward ...
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    Default Radiator Valve Sizes

    I tried to adjust the lockshield valve on my 15 year kitchen radiator and it started leaking. I therefore decided to replace it and thought this would be a straightforward job. Unfortunately, the thread on the old valve appeared to be about 1" in diameter as was the nut on the radiator outlet.

    I went round to our local Graham Plumbing merchant and nobody there seemed to have ever come across a radiator with this size valve before. If I can't find a suitable valve or converter then this radiator will need to be replaced which seems a little bit drastic.

    Is the world going mad or is there a plumber out there who can offer me a solution?

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    Default Re: Radiator Valve Sizes

    Post a pic of the valve. You might need. Valve & rad tail

    A pic will tell a thousand words

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    Default Re: Radiator Valve Sizes

    Most new radiator valves are 1/2 inch, thread/ 15mm copper. You have a union type radiator valve. These are 1". The trouble is that there are lots of different types of these, so you are better off removing the tail ( the bit in the rad) and use the tail that comes with a new valve.
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    Default Re: Radiator Valve Sizes

    Hi 3/4" on domestic is normally the biggest on a rad this age
    Commercial valves can be bigger for black iron fitting
    try using brass bushes or reducers to get to the correct size if there is enough room on the pipework
    use a good seal prob PTFE as bushes and reducers are often not tapered

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    Default Re: Radiator Valve Sizes

    Welcome AWJD to the forum's......any chance of a picture of the valve as it could be helpful with your enquiry.....regards Turnpin
    IF AT FIRST YOU DON`T SUCCEED ...LET SOMEONE ELSE HAVE A GO WHO KNOW`S WHAT THEIR DOING

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    Default Re: Radiator Valve Sizes

    Quote Originally Posted by COHIBA1207 View Post
    Hi 3/4" on domestic is normally the biggest on a rad this age
    Commercial valves can be bigger for black iron fitting
    try using brass bushes or reducers to get to the correct size if there is enough room on the pipework
    use a good seal prob PTFE as bushes and reducers are often not tapered
    It's a lockshield Union mate
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    Default Re: Radiator Valve Sizes

    Quote Originally Posted by COHIBA1207 View Post
    Hi 3/4" on domestic is normally the biggest on a rad this age
    Commercial valves can be bigger for black iron fitting
    try using brass bushes or reducers to get to the correct size if there is enough room on the pipework
    use a good seal prob PTFE as bushes and reducers are often not tapered
    Welcome to the forum.

    Bit of an over kill isn`t? Bushes and fittings can be parallel or tapered threads and easy for an amateur to get wrong.

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    Default Re: Radiator Valve Sizes

    I attempted to load a picture of the valve via the 'Image' icon but, after selecting the file, the update file(s) link didn't work. Could someone please explain what is going wrong?

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    Default Re: Radiator Valve Sizes

    Not sure the upload of the picture worked but if it did it shows the Lockshield valve with 1" thread. .

    Radiator Valve Sizes-rad_valve.jpg

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    Default Re: Radiator Valve Sizes

    Stnd drain off lockshield, if it's leaking where the ptfe tape is wants some compound on it
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    IMPORTANT:
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    Want gas safety or boiler repair advice? :
    Please supply your Gas Safe / Oftec / Hetas Number, DIYers, odd job people and have a go heroes need not apply, and remember any fuel burning appliance can kill


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    Default Re: Radiator Valve Sizes

    Take the picture on your phone to screwfix with you they sell them fitted one today it's a standard valve bud

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    Default Re: Radiator Valve Sizes

    Isn`t it an O-ring to make the seal?

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